Improved vise



@sind @hijita JOI-1N B. WILLETT, OF WEST MERIDEN, CONNECTICUT.

Letters Patent No. 90,800, dated June 1, 1869.

IMPRO'VED VISIE.

The Schedule referred to in these Letten; Patent and making part of the saune.

To all whom it ma/y concern.-

Be it known that I, J ons B. WILLETT, of West Meriden, in the connty of New Haven, and State of Connecticut, have invented a new and improved Vise;

and I do -hereby declare the following, when taken in are known as parallel vises, the object being to con-r struct the vise so that both jaws may be adjustable, to conform to angular pieces which may be placed therein, and, at the same time, be secured in a position parallel to each other.

To enable others to make and use my improvement,

. I will fully describe the same, as illustrated in the accompanying drawings.

A is the base, to which the stationary jaw B is attached.

C, a parallel bar passing through the base A, to which said bar the travelling jaw D is fixed.

Heretofore, in this class of vises, the, two jaws have been rigidly fixed to the base and bar, respectively. I n some instances, the cheek of one of the jaws has been made to be turned to an inclination to the other ljaw, so as to grasp articles of different, or inclined surfaces, but in such, as the movable jaw turns, it carries one end from and the other toward the other jaw.

The result of this, as seen in Figure 6, is, that the article cannot be operated upon near the end of the jaw. This inclination practically lengthens the two jaws to the red line in said iig. 6, but by the turning ofbothjaws, as denoted in red, g. 2, the position of the jaws always corresponds.

To effect this, I form upon the base and bar, respectively, a circular dovetail projection, a, as seen in gs.3 and 4; then, upon the under side of the two jaws, I cut a corresponding recess, as seen in iig. 5, so that the jaw will slide upon thesaid projection a, until it comes to a bearing. Then into the recess back of the projection, I place blocks d, as seen in Figure 7, which ill the space around the projection a, and form a bearing upon which both jaws will turn freely to the right or left, as the c ase may be.

To secure the blocks d, and also to secure the jaws in a xed parallel position, I arrangedn each a setscrew, f, which passes through the blocks d, and into the base of the one and bar of the other, as seen iu iig. 3, when the said jaws are in a position parallel to each other. n

VWhen it is desired that the jaws, one or both, may turn upon their bearing, withdrawthe screw, so as to free the jaws from the baseer bar, as the case may be. Then, when the article is placed between the jaws, and the travelling-'jaw forced forward, the twov jaws will assume a position to firmly graspand hold the article, as denoted in red, fig. 2.

Having fully described my invention, s

What I claim as new and useful, and desire to secure 'by Letters Patent, isl The dovetail projection a, upon the base and arm and the corresponding recess b, in -the jaws, with the block d, the set-screws j', for forming a bearing upon which the jaws will turn, substantially as set forth.

` JOHN B. WILLETT. Witnesses:

GEO. W. SMITH, D. C. A. M. QUEvILLoN. 

